OTIS OI-6000K NXP Series, Operation Manual

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Page 3: ...ENTS INC OI 6000K X X X NXP X IS AN AMBIENT AIR TOXIC GAS SENSOR ASSEMBLY AND ONLY MONITORS IN THE IMMEDIATE VICINITY OF THE SENSOR HOUSING A SITE SURVEY IS REQUIRED IN ORDER TO DETERMINE THE BEST PLACEMENT AND QUANTITY OF SENSOR ASSEMBLIES IMPROPER INSTALLATION CAN LEAD TO AN UNDETECTABLE GAS LEAK WHICH COULD RESULT IN PERSONAL INJURY OR LOSS OF LIFE THE OI 600K X X X NXP X IS NOT TO BE USED IN C...

Page 4: ...ING MODE 21 3 PRODUCT SETTINGS AND CONFIGURATION 22 3 1 RELAY TEST 22 3 1 1 PERFORMING THE RELAY TEST 23 3 2 SYSTEM INFORMATION 23 3 3 NULL CALIBRATION TIMER INFORMATION 24 3 4 UNIT INFORMATION 24 3 5 LATCHING AND NON LATCHING RELAY SETTINGS 25 3 5 1 RELAY 1 LATCHING NON LATCHING SETTING 25 3 5 2 RELAY 2 LATCHING NON LATCHING SETTING 26 3 6 RELAY FAIL SAFE SETTING 26 3 6 1 RELAY 1 FAIL SAFE SETTIN...

Page 5: ... RISE FALL SETTING 43 4 3 3 SENSOR HIGH ALARM SETTING 43 4 3 4 SENSOR HIGH ALARM RISE FALL SETTING 44 4 4 MANUAL RESET FOR ACTIVATED LATCHING ALARMS 44 5 PRODUCT MAINTENANCE 45 5 1 SCHEDULED MAINTENANCE 45 5 2 SENSOR REPLACEMENT 46 5 3 PRODUCT TROUBLESHOOTING 48 5 4 PRODUCT REPLACEMENT PARTS AND ACCESSORIES 49 APPENDIX A INTRODUCTION TO 4 20 MA CURRENT LOOP SIGNALS 51 APPENDIX B MODBUS COMMUNICATI...

Page 6: ... 6000 display screen will always show the present concentration of gas being detected by the sensor assembly This document is an operation manual containing diagrams and step by step instructions for the proper and safe installation start up configuration and settings normal operation and product maintenance of the OI 6000K NOTICE This document should be read in its entirety before the initial ope...

Page 7: ...e EMI Filter 4 20 mA Surge Suppression RS 485 Modbus Surge Suppression Display Transflective sunlight readable 102x64 LCD Screen LED Back Light Interface 3 Push Buttons MENU ADD SUB LOW and HIGH Alarm Indicator LEDs Outputs Wired Analog 4 20 mA 3 Wire Wired Digital RS 485 Modbus RTU Relays Two Dry Contact Relays Pre wired to Strobe Light and Horn Mechanical Specifications Enclosure Materials Fiber...

Page 8: ...omponents that may be referred to in this manual 1 3 1 EXTERNAL SYSTEM DIAGRAM 1 Strobe Light 2 Mounting Foot 4X 3 Enclosure Latch 2X 4 Front Panel Thumb Screw 2X 5 SUB Button 6 Sensor Housing Assembly 7 LOW and HIGH LED Indicators 8 Dual Tone Horn 9 Optional AC Power Cord 10 ADD Button 11 MENU Button 12 LCD Display Screen 13 Calibration Adapter Kit Sold Separately ...

Page 9: ... Block 2 Fault Terminal Block 3 Power Input 4 20mA Output Terminal Block 4 Optional AC Power Supply 5 Digital Sensor Board Cable and Connector 6 Sensor Housing Interface Board 7 Sensor Interface Adapter Board 8 Wiring Terminal Block 9 Relay 1 Terminal Block 10 Relay 2 Terminal Block 11 Digital Sensor Board Socket ...

Page 10: ...00K X X X NXP X OPS_GUIDE_REV 1 0 1 3 3 ASSEMBLY DIAGRAM 1 Strobe Light 2 Enclosure Base 3 Sensor Housing Base 4 Sensor Element 5 Sensor Housing Cap 6 Electronics Assembly 7 Gas Type Label 8 Faceplate Assembly 9 Enclosure Lid ...

Page 11: ... area that will produce the highest gas concentration Enclosed corners and stopping points of moving devices are two areas susceptible to a buildup of toxic gas In order to provide an accurate representative sample of a room care should be taken to avoid locating the unit near a room entrance fresh air intake vent or vehicle generator exhaust point The unit should be placed as close as physically ...

Page 12: ...pendent upon the desired usage and functionality intended by the end user All OI 6000K units require 12 to 35 Volts of wired DC power to operate Data communication from the device through either the 4 20 output or the RS 485 Modbus connection to an external location are optional Consult the subsequent sections of wiring instructions for pertinent information and guidelines pertaining to the instal...

Page 13: ...2 3 2 CONNECTING POWER The AC model OI 6000K comes with a standard power cord that is plugged into a regular wall outlet you may skip the below DC wiring instructions and advance to the 4 20 wiring if that functionality is desired To provide DC power to the OI 6000K you will need to connect the power cable from the sensor terminal block on an Otis monitor or alternate user supplied power source to...

Page 14: ...e is the ONLY requirement for the OI 6000K to operate With the provision of power the unit will function normally indicating the presence of toxic gas at the sensor and providing the gas level reading on the display screen To utilize the added functionality of the device additional wiring is necessary If an Otis Monitor is not used the OI 6000K can be powered from any 12 to 35 VDC power supply tha...

Page 15: ...GEN II Model OI 6000K Detector 1 Feed the signal wire through the electrician installed cord grip and into the enclosure NOTICE The power and signal wires may be conjoined as a 3 wire cable incorporating the power RED ground BLACK and signal GREEN wires all into one jacketed cable 2 Locate the terminal block on the backplane and complete the following a Connect the signal GREEN wire to the 4 20 mA...

Page 16: ...el OI 6000K Detector 1 Feed the RS 485 cable through a cord grip and into the enclosure 2 Locate the RS 485 output terminal block on the control board and complete the following a Connect the RS 485 B BROWN wire to the B terminal b Connect the ground WHITE wire to the GND terminal c Connect the RS 485 A YELLOW wire to the A terminal On the Otis Monitor 1 Feed the RS 485 cable through a cord grip a...

Page 17: ...S 485 TERMINAL A YELLOW A YELLOW GND WHITE GND WHITE B BROWN B BROWN NOTICE If an Otis Monitor is not used the OI 6000K can be connected to a Programmable Logic Controller PLC for RS 485 Modbus data communications For integration and setup refer to the Modbus Register Map found in Appendix C of this manual ...

Page 18: ... the OI 6000K Detector 1 Locate the wiring terminal block on the backplane of the enclosure and complete the following a Connect a RED jumper wire to the positive supply terminal b Connect the BLACK wire from the OI 481 X to the negative supply terminal c Connect the BLACK wire from the OI 488 to the negative supply terminal as well 2 Locate the Relay 1 terminal block on the radio relay board and ...

Page 19: ...CTING OI 481 R OI 481 A OI 481 B STROBE LIGHT AND OI 488 HORN BACKPLANE WIRING TERMINAL BLOCK OI 6000K RELAY 1 TERMINAL OI 6000K RELAY 2 TERMINAL NEGATIVE OI 481 X BLACK WIRE NC NC OI 488 BLACK WIRE POSITIVE RED NO OI 481 X RED WIRE NO OI 488 RED WIRE COM BLUE COM BLUE RED ...

Page 20: ...e OI 488 to the negative supply terminal as well 2 Locate the Relay 1 terminal block on the radio relay board and complete the following a Connect a BLUE jumper wire to the COM terminal b Connect the YELLOW wire from the OI 481 RGA to the NO terminal c Connect the GREEN BLUE wire from the OI 481 RGA to the NC terminal 3 Locate the Relay 2 terminal block on the radio relay board and complete the fo...

Page 21: ...GHT AND OI 488 HORN NON O2 SENSORS BACKPLANE WIRING TERMINAL BLOCK OI 6000K RELAY 1 TERMINAL OI 6000K RELAY 2 TERMINAL NEGATIVE OI 481 RGA BLACK WIRE NC OI 481 RGA GREEN BLUE WIRE NC OI 488 BLACK WIRE POSITIVE RED NO OI 481 RGA YELLOW WIRE NO OI 481 RGA RED WIRE OI 488 RED WIRE COM BLUE COM BLUE RED ...

Page 22: ... the OI 488 to the negative supply terminal as well 2 Locate the Relay 1 terminal block on the radio relay board and complete the following a Connect a BLUE jumper wire to the COM terminal b Connect the YELLOW wire from the OI 481 RGA to the NO terminal c Connect the GREEN BLUE wire from the OI 481 RGA to the NC terminal 3 Locate the Relay 2 terminal block on the radio relay board and complete the...

Page 23: ...LIGHT AND OI 488 HORN O2 SENSORS BACKPLANE WIRING TERMINAL BLOCK OI 6000K RELAY 1 TERMINAL OI 6000K RELAY 2 TERMINAL NEGATIVE OI 481 RGA BLACK WIRE NC OI 481 RGA GREEN BLUE WIRE NC BLUE OI 488 BLACK WIRE POSITIVE RED NO OI 481 RGA YELLOW WIRE NO OI 481 RGA RED WIRE OI 488 RED WIRE COM BLUE COM RED ...

Page 24: ...contact requiring only the power and ground wires of the external fault device to be wired during installation Refer to the following instructions for how to wire your device On the external fault device light horn 1 Locate the power RED and ground BLACK wires on the alarming device On the GEN II Model OI 6000K Detector 1 Feed the alarming device wires through a cord grip and into the enclosure 2 ...

Page 25: ...ht 3 Close the enclosure lid and secure shut with the right side latches 2 4 SYSTEM START UP After the enclosure is closed and power is applied the unit will start automatically and begin its 1 minute warmup period During warmup the display will show a countdown of the time remaining until the system start up is complete The Otis logo and the unit information will also show on the display screen d...

Page 26: ... left corner of the display appears on both screens The unit continuously registers that the system is in fault so that even with at a glance instrument checks in the field it can be seen When the fault is corrected the unit will return to normal operating mode For a list of the fault codes and warning symbols of the OI 6000K and their associated meaning refer to the Product Troubleshooting sectio...

Page 27: ...duct settings and configuration menu is activated and open on the display screen 3 1 RELAY TEST The relay test simulates a gas level reading indicating the presence of a toxic gas at the sensor The relay test is used to ensure the proper functionality of the relay settings on the monitor The test can also be used to simulate emergency safety drills onsite NOTICE The triggering of relays from the d...

Page 28: ...tested and the test is complete press the SUB button to return the relay test reading back to zero and to deactivate the monitor alarm s 3 Press the MENU button to advance to the System Information screen 3 2 SYSTEM INFORMATION The system information screen allows the end user to view the following information The scale of the sensor element The supply voltage to the sensor assembly The voltage va...

Page 29: ...librated only updates while the unit is turned on The calibration number of the sensor used for diagnostic purposes This screen is for informational purposes only 1 Press the MENU button to advance to the Unit Information screen 3 4 UNIT INFORMATION The unit information screen allows the end user to view the following information The date of manufacture of the sensor assembly The serial number of ...

Page 30: ... latching During installation and setup Relay 1 and Relay 2 are commonly customized as the following Common Relay 1 and Relay 2 Settings Relay Alarm Setting Latching Non Latching Relay 1 Low Non Latching Relay 2 High Latching 3 5 1 RELAY 1 LATCHING NON LATCHING SETTING 1 Use the ADD and SUB buttons to toggle between the UnLatch and Latch options 2 Press the MENU button to select the desired settin...

Page 31: ...ing the Fault Terminal section of this manual Site specific circumstances may prevent the use of the fault terminal leading to potentially dangerous situations without end user notification In response the OI 6000K provides a relay fail safe setting to enhance the safety protection provided when the fault terminal cannot be used The relay fail safe setting reverses the behavior of the relays and a...

Page 32: ... External Power Supply Normally Open NO Yes On Normal Operation Closed Alarm Activation Closed 3 6 1 RELAY 1 FAIL SAFE SETTING 1 Use the ADD and SUB buttons to select the desired fail safe setting for Relay 1 Select Yes to turn the fail safe setting on or select No to leave the fail safe setting off 2 Press the MENU button to select the desired setting and to advance to the Relay 2 fail safe setti...

Page 33: ...n the fail safe setting off 2 Press the MENU button to select the desired setting and to advance to the Calibration Method setting screen 3 8 CALIBRATION METHOD The calibration method selection allows you to choose how you calibrate the sensor element Manual calibration is the default method for all gas types Manual calibration lets you use the ADD and SUB buttons during calibration to match the r...

Page 34: ...us has 255 addresses ranging from 1 to 255 Eight of the addresses are used for internal system settings leaving addresses 1 to 247 available for your device The RS 485 Modbus communication parameters used in Otis devices is 8 data bits no parity and 1 stop bit these parameters are fixed and cannot be changed The floating point data values are presented with the least significant bytes first When u...

Page 35: ...dbus communication parameters used in all Otis devices are 8 data bits no parity bit and 1 stop bit 8 N 1 these parameters are fixed and cannot be changed Some devices come with different Modbus baud rates Check with your system administrator to determine if a different Modbus baud setting is needed for your system The pre set Modbus baud setting available for the OI 6000K are the following 110 bp...

Page 36: ...he reading on the OI 6000K no longer matches the reading on the monitoring device the 4 20 mA offset will need to be recalibrated The factory default settings on the OI 6000K for the 4 20 mA offset are 4 00 mA for the zero offset and 20 00 mA for the full scale offset 1 Press the ADD button to select Yes to set the 4 20 mA offset and to advance to the zero offset setting screen If you do not wish ...

Page 37: ...eme sunlight the brightness of the display screen may need to be adjusted for optimum viewing The factory default setting on the OI 6000K for the display screen contrast is 29 approximately 45 of the contrast scale The contrast setting ranges from 1 to 64 NOTICE Setting the contrast too low will cause the display image to become faint or indistinguishable especially when the unit is located in are...

Page 38: ...Latching Non Latching UnLatch Relay 2 Latching Non Latching UnLatch Relay 1 Fail Safe Setting No Off Relay 2 Fail Safe Setting No Off Calibration Method Manual RS 485 Modbus Address Setting 1 RS 485 Modbus Baud Setting 9600 bps 4 20 mA Zero Offset Setting 4 00 mA 4 20 mA Full Scale Offset Setting 20 00 mA Contrast OI 6000K Operation Factory Default Settings Configuration Setting Sensor Element Nul...

Page 39: ...een If Yes is selected to return the device to its factory default settings 1 Press the ADD button to select Yes to confirm that you want to reset the device to its factory default settings and to return the device to normal operating mode If you do not wish to continue to return the device to its factory default settings press the SUB button to select No to continue to the Reset Null Cal Only scr...

Page 40: ...null and calibration values press the SUB button to select No to leave the product settings and configuration menu and to return the device to normal operating mode If Yes is selected to reset the null and calibration values 2 Press the ADD button to select Yes to confirm that you want to reset the Null and Calibration values and to return the device to normal operating mode If you do not wish to ...

Page 41: ... Powering off the device stops the operation of the unit The product settings and configuration as well as the operation settings including the null and calibration of the sensor will be unaffected 1 Press and hold the SUB button for approximately 6 seconds until OFF shows on the display screen The display screen will continue to show OFF for the duration of time that the unit is powered off as lo...

Page 42: ... Otis recommends that you calibrate your device regularly to ensure proper functionality and a safe work environment 4 2 1 NULLING THE SENSOR AUTO NULL The first step of calibration is nulling the sensor sometimes referred to as setting the zero or zeroing the sensor The nulling process MUST be performed in known clean air with no contaminants or hazardous gasses present before calibrating the sen...

Page 43: ... to discontinue the null process and to return to the previous screen NOTICE If Yes is selected at this point the null process cannot be stopped without disconnecting the power from the unit 4 The unit will automatically begin the 6 second null process During null the display will show a countdown of the time remaining until the process is complete 5 When null process is complete press the MENU bu...

Page 44: ...housing of the device 3 Affix a regulator to the calibration gas bottle 4 Attach the tubing on the Calibration Adapter Kit to the regulator on the calibration gas bottle 5 Ensure that the gas is flowing and watch the reading increase When the reading stabilizes approximately 1 minute use the ADD and SUB buttons to adjust the reading on the screen to match the applied calibration gas concentration ...

Page 45: ...te the sensor press the SUB button to select No to advance to the sensor radio address setting screen 2 Press the ADD button to select Yes to confirm that you want to calibrate the sensor and to continue to the concentration setting screen If you do not wish to continue to calibrate the sensor press the SUB button to select No to advance to the sensor radio address setting screen 3 Use the ADD and...

Page 46: ...tically begin the calibration process the amount of time on the timer will vary based on the gas type During calibration the display will show a countdown of the time remaining until the process is complete NOTICE Once the calibration countdown has started the process cannot be stopped without disconnecting the power from the unit 8 When calibration is complete detach the Calibration Adapter Kit f...

Page 47: ...d the HIGH alarm when the detected gas concentration RISES above the HIGH alarm set point The factory default setting for all other gas types is to activate when the detected gas RISES above the alarm set point When the gas concentration detected at the sensor meets or exceeds the LOW alarm set point the LOW alarm indicator LED will illuminate amber When the gas level meets or exceeds the HIGH ala...

Page 48: ...Falling gas level respectively 2 Press the MENU button to save the desired setting and to advance to the sensor HIGH alarm setting screen 4 3 3 SENSOR HIGH ALARM SETTING 1 Use the ADD and SUB buttons to increase and decrease the HIGH alarm set point respectively 2 Press the MENU button to save the desired setting and to advance to the sensor HIGH alarm rise fall setting screen ...

Page 49: ...el reading at the sensor has fallen 10 below the alarm set point 4 4 MANUAL RESET FOR ACTIVATED LATCHING ALARMS Relay alarms set to latching will not deactivate until the alarms are manually reset at the device This includes LOW and HIGH alarm indicator LEDs and wired relays When latching alarms have been activated refer to the following instructions for how to manually deactivate the alarms on yo...

Page 50: ...ugs and insects and or any other debris that could potentially cover or coat the sensor Keeping the sensor head clear of foreign articles will allow for proper operation of the device A brief inspection during scheduled maintenance should suffice but dependent upon the location and the environment in which the unit is installed more frequent inspections may be warranted The sensor assembly may be ...

Page 51: ... sensing element the device MUST then be nulled and calibrated for proper operation of the device CAUTION The internal components can be static sensitive Use caution when opening the enclosure and handling internal components DO NOT use any metal objects or tools to remove the sensing element from the sensor adapter board 1 Press and hold the SUB button for approximately 6 seconds until OFF shows ...

Page 52: ... new sensing element into the sensor housing board Ensure that the pins on the sensing element align with the sockets on the sensor housing board 5 Screw the sensor housing cap back onto the sensor housing base ensuring that the sensor housing cap is only tightened hand tight ...

Page 53: ...place the sensor element 3 Replace the sensor interface board F6 Try to Calibrate Again 1 The unit did not calibrate correctly due to the absence of gas a sensor error or a sensor interface board error 1 Recalibrate the sensor element and verify that gas is present during calibration 2 Replace the sensor element 3 Replace the sensor interface board F14 Check Radio 1 The sensor assembly has lost co...

Page 54: ...ical Sensor Housing Base OI 254NXP BASE IR PID Sensor Housing Base OI 140NXP BASE Sensor Housing Cap with Screen OI 254NXP CAP Internal Replacement Parts Part Name Otis Part Number Control board with LCD Screen OI 6000 CB KIT Relay Board OI 6000 MRB PCA Digital Sensor Interface Adapter Board OI 6000 NXP DB PCA Infrared Sensor Interface Adapter Board OI 2011 NXP S PID Sensor Interface Adapter Board...

Page 55: ...DIX A INTRODUCTION TO 4 20 mA CURRENT LOOP SIGNALS APPENDIX B MODBUS COMMUNICATIONS APPENDIX C MODBUS REGISTER MAP APPENDIX D OTIS INSTRUMENTS PRODUCT WARRANTY STATEMENT APPENDIX E INFORMATION ABOUT RMA SERVICE REPAIRS APPENDIX F INFORMATION ABOUT RMA RETURNS FOR CREDIT ...

Page 56: ...ges Current Detector Status 2 5 mA Sensor Fault 3 mA Sensor in Menu Mode 3 5 mA Sensor in Calibration Mode The 4 mA allows the receiving monitor PLC to distinguish between a zero signal a broken wire or an unresponsive instrument Benefits of 4 20 mA convention are that it is an industry standard low cost to implement can reject some forms of electrical noise and the signal does not change value ar...

Page 57: ...3 0 5 PPM Infrared IR Carbon Dioxide CO2 0 5 Infrared IR Combustible Gas LEL 0 100 Photo Ionization Detector PID Volatile Organic Compounds VOC10 0 10 PPM Photo Ionization Detector PID Volatile Organic Compounds VOC20 0 20 PPM Photo Ionization Detector PID Volatile Organic Compounds VOC50 0 50 PPM Photo Ionization Detector PID Volatile Organic Compounds VOC1K 0 1000 PPM Photo Ionization Detector P...

Page 58: ... a type of wiring in which two conductors of a single circuit are twisted together for the purposes of canceling out electromagnetic interference EMI from external sources as well as crosstalk between neighboring pairs In electronics crosstalk is any phenomenon by which a signal transmitted on one circuit or channel of a transmission system creates an undesired effect in another circuit or channel...

Page 59: ...device in the chain directly connected to the monitor RS 485 Modbus Connection Distances for Electrical Wiring Distance Length Gauge Size Twisted Pairs Short 100 Feet 22 to 24 Gauge Shielded in areas of high noise Medium 101 Feet to 1 000 Feet 18 to 20 Gauge Shielded in areas of high noise Long 1 000 Feet to 4 000 Feet 18 to 20 Gauge Shielded in areas of high noise Terminating resistor may be requ...

Page 60: ... 2 Setting R 2 FLOAT 1 32000 16 22 Precision R 1 INT 0 3 17 23 Relay Setting R 1 BFLD See Relay Setting Table 18 24 Days Since Last Null R 1 UINT 0 60000 60000 Default to Never 19 25 Calibration Type R 1 ENUM 0 1 1A 26 Auto Calibration Value R 2 FLOAT Numerical Gas Reading 1C 28 Days Since Last Calibration R 1 UINT 0 60000 60000 Default to Never 1E 30 Relay 1 State R 1 INT 0 Relay Inactive 1 Relay...

Page 61: ...ster Address 8 Mode of Sensor Response Sensor Mode 0 Normal Operating Mode 1 Null Mode 2 Calibration Mode 3 Relay Test Mode 5 Diagnostic Mode 6 Advanced Mode 7 Administrator Mode Register Address B 11 Fault Code Response Fault Type 0 No Fault 1 Loss of Communication with Sensor Board 4 Loss of Communication with Sensor Element Housing 5 Null Error 6 Calibration Error Register Address C 12 Sensor T...

Page 62: ...ty h defects caused by normal wear and tear or otherwise due to the normal aging of the Otis product or i any product in which a product labeled serial number has been removed defaced or altered in any way If examination and assessment discloses that the alleged defect in the product does not exist or was caused by the end user purchaser or any third party misuse neglect improper wiring or install...

Page 63: ...rts or Otis Products A replacement part or Otis Product including a user installable part that has been installed in accordance with instructions provided by Otis assumes the remaining term of the Warranty or ninety 90 days from the date of replacement or repair whichever provides the longer coverage for the end user purchaser When an Otis product or part is replaced or a refund is provided any re...

Page 64: ...y must be removed prior to shipment Failure to adhere to these instructions will result in the products parts being returned to sender Once the RMA Service Repair Form is received by the Otis Instruments RMA Service Department a RMA Service number will be generated The RMA Service number will be sent to the email address provided for verification of receipt RMA Service quotes have a thirty 30 day ...

Page 65: ...ONAL RMA SERVICE REPAIRS The customer is responsible for complying with all import export requirements for shipment of RMA Service repairs to Otis Instruments Inc OTIS INSTRUMENTS RMA SERVICE DEPARTMENT Otis Instruments Repairs 301 South Texas Ave Bryan Texas 77803 Office 979 776 7700 Fax 979 776 7719 service otisinstruments com www otisinstruments com RMA ...

Page 66: ... must be completed in its entirety and included within the box at the time of shipment Customer contact information and product information including model number serial number and specific reason s for service will need to be accessible in order to complete the form Shipments received that do not include the form or if the form is incomplete will be returned uncredited COD to the customer Once th...

Page 67: ...APPENDICES OI 6000K X X X NXP X OPS_GUIDE_REV 1 0 62 Notes ...

Page 68: ...Otis Instruments 301 S Texas Avenue Bryan Texas 77803 Tel 979 776 7700 Fax 979 776 7719 sales otisinstruments com service otisinstruments com www otisinstruments com ...